#include <iostream>
#include <bits/ostream.tcc>
//
// Created by Asus on 2025/5/13.
//
// main.cpp
extern int globalVar; // 声明外部变量，不分配内存

int main(int argc, char *argv[]) {
    globalVar = 100;
    std::cout << globalVar << std::endl;
}
